Mixture with low surface tension which consists of fluorinated alkylammonium monoalkyl sulfates and fluoroalkyl-sulfatobetaines

Abstract

Mixture with low surface tension, containing 10 to 80% by weight of at least one compound of the formula ##STR1## in which R f is perfluoroalkyl with 3 to 36 C atoms, R 1 is alkyl with 1 to 4 C atoms, R 2 is alkyl with 1 to 4 C atoms, cyclohexyl or 2-hydroxyalkyl with 2 to 4 C atoms, Q is --CH 2 CH 2 -- or ##STR2## m is the number 0 or 1 and, if m is 0, p is an integer of from 1 to 4 and if m is 1, p is the number 1, and 90 to 20% by weight of at least one compound of the formula ##STR3## in which R f , R 1 , R 2 , Q, m and p are as defined above.

I claim: 
     
       1. Mixture with low surface tension, containing 10 to 80% by weight, based on the mixture, of at least one compound of the formula ##STR35## in which R f  denotes a perfluoroalkyl radical with 3 to 16 C atoms, R 1  denotes an alkyl radical with 1 to 4 C atoms, R 2  denotes an alkyl radical with 1 to 4 C atoms, a cyclohexyl radical or a 2-hydroxyalkyl radical with 2 to 4 C atoms, Q denotes a --CH 2  CH 2  -- or ##STR36## radical, m denotes the number 0 or 1 and, if m is 0, p is an integer from 1 to 4 and if m is 1, p is the number 1, and 90 to 20% by weight, based on the mixture, of at least one compound of the formula ##STR37## in which R f , R 1 , R 2 , Q, m and p are as defined above. 
     
     
       2. Mixture as claimed in claim 1, containing 20 to 75% by weight, based on the mixture, of at least one compound of the formula (I), and 80 to 25% by weight, based on the mixture, of at least one compound of the formula (II), the symbols R f , R 1 , R 2 , Q, m and p in the formulae (I) and (II) being as defined in claim 1. 
     
     
       3. Mixture as claimed in claims 1 or 2, wherein, in the formulae (I) and (II), R f  denotes a perfluoroalkyl radical with 5 to 12 C atoms, R 1  denotes an alkyl radical with 1 to 2 C atoms, R 2  denotes an alkyl radical with 1 to 2 C atoms, Q denotes a --CH 2  CH 2  -- radical or a ##STR38## radical, m denotes the number 0 or 1 and, if m is 0, p is an integer from 2 to 4, and if m is 1, p is the number 1. 
     
     
       4. Process for the manufacture of a mixture as claimed in claim 1, which comprises treating at least one compound of the formula ##STR39## in which R f , R 1 , R 2 , Q, m and p are as defined in claim 1, at a temperature of about 20° to 140° C. and under a pressure of 1 to 1,000 mbars for about 0.3 to 6 hours. 
     
     
       5. Process as claimed in claim 4, wherein the treatment is carried out at a temperature of 40° to 120° C. for 0.5 to 3 hours, the pressure being set so that it is the same as or lower than the pressure under which the alcohol R 1  OH, in which the R 1  corresponds to the R 1  of the compound of the formula (I) employed, boils at the treatment temperature chosen.